Strictly speaking, no activity and no industry is possible without a certain amount of violence, no matter how little. Even the very process of living is impossible without a certain amount of violence. What we have to do is to minimize it to the greatest extent possible.
the audience is the controlling factor in the actor's life. It is practically infallible, since there is no appeal from its verdict. It is a little like a supreme court composed of irresponsible minors.